I agree. There is an alternative testsuite. Check Unofficial Test Suite (go-fed/testsuite) created by @cjs . Imho, given this is the only functioning testsuite, it could as well become the Official one 
The testsuite should be made discoverable, though, like with a mention on activitypub.rocks. Same for @dansup’s FediDB (which is out of closed beta, I think?). See Introducing FediDB - DevTools for ActivityPub.
There’s an ongoing discussion related to this: Easing the onboarding of new developers to the Fediverse.